Identifying Functions

1. Find the output, $g$, when the input, $r$, is $3$.

$g=-5 r+13$

2. Find the output, $b$, when the input, $a$, is $6$.

$b=-1-7 a$

3. Find the output, $y$, when the input, $x$, is $5$.

$y=5 x-3$

4. Find the output, $k$, when the input, $t$, is $-7$.

$k=10 t-19$